I found this on Reddit and it worked for me. It also works with Lutris. Appid is Heroic or Lutris folder. If the folders don’t exist when copying them over create it. Copy the commands one by one in the environment variables of the launcher for each game. Also I believe every time there is an update to Lossless or lsfg-vk you have copy over the updated files.
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Сору ~/.local/lib/liblsfg-vk.so to ~/.var/app/<Appld>/lib
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Copy Lossless.dll (inside Lossless Scaling directory) to ~/.var/app/<Appld>/data/ Steam/steamapps/common/Lossless Scaling
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Copy ~/.local/share/vulkan/implicit_layer.d/VkLayer_LS_frame_generation.json to ~/.var/ app/<Appld>/config/vulkan/implicit_layer.d